An employee stands next to a barista robot that takes orders, makes coffee and brings the drinks straight to customers in Daejeon, South Korea, May 25, 2020. REUTERS/Kim Hong-Ji

Staff of 'Barista' coffee shop waits outside the shop at World Trade Center, after the government announced that private and state companies will reopen their offices after almost two months of lockdown amidst concerns about the spread of coronavirus disease (COVID-19) in Colombo, Sri Lanka May 11, 2020. REUTERS/Dinuka Liyanawatte

A barista wearing a protective face mask and gloves serves takeaway coffee at a cafe amid the coronavirus disease (COVID-19) outbreak in Kiev, Ukraine May 8, 2020. REUTERS/Valentyn Ogirenko

A barista wearing a protective face mask and gloves holds a tray full of pastries at a cafe in Trastevere which reopened for takeaways only, as Italy begins a staged end to a nationwide lockdown due to the spread of the coronavirus disease (COVID-19), in Rome, Italy May 6, 2020. REUTERS/Guglielmo Mangiapane

A barista wears a protective mask as she serves takeaway coffee at a cafe in Trastevere which reopened for takeaways only, as Italy begins a staged end to a nationwide lockdown due to the spread of the coronavirus disease (COVID-19), in Rome, Italy May 6, 2020. REUTERS/Guglielmo Mangiapane

A barista wears a protective mask as she prepares takeaway coffee at a cafe in Trastevere which reopened for takeaways only, as Italy begins a staged end to a nationwide lockdown due to the spread of the coronavirus disease (COVID-19), in Rome, Italy May 6, 2020. REUTERS/Guglielmo Mangiapane

A barista wearing a protective mask takes a coffee cup inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

A barista wearing a protective mask makes a cappuccino inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

A barista wearing protective gloves prepares a macchiato inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

Baristas wearing protective masks talk to their manager inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

A barista wearing a protective mask makes a cappuccino inside a cafe as the spread of the coronavirus disease (COVID-19) continues in Belgrade, Serbia, May 5, 2020. As the rate of infections has slowed sufficiently, cafes and restaurants in Serbia and its capital Belgrade opened again for patrons after almost two months. REUTERS/Marko Djurica

A barista prepares a coffee at a cafe, as Italy begins a staged end to a nationwide lockdown due to the spread of the coronavirus disease (COVID-19), in Naples, Italy May 4, 2020. REUTERS/Ciro De Luca

Racheal Grina, a barista who has been working as a diet clerk during the pandemic, poses for a portrait at the Swedish Medical Center Issaquah campus during the coronavirus disease (COVID-19) outbreak, in Issaquah, Washington, U.S. April 21, 2020. "I love watching people get healthy. As a diet clerk, they come in at their worst and they leave feeling better," she says. REUTERS/David Ryder

Barista Chen Chao poses for a picture as he waits for customers at a cafe that is closed for regular business but open for takeout in the Wudaoying Hutong, one of the top tourist destinations in Beijing, as the spread of the novel coronavirus disease (COVID-19) continues in China April 10, 2020. Picture taken April 10, 2020. REUTERS/Thomas Peter

Barista Chen Chao serves a customer through the door of a cafe that is closed for regular business but open for takeout in the Wudaoying Hutong, one of the top tourist destinations in Beijing, as the spread of the novel coronavirus disease (COVID-19) continues in China April 10, 2020. Picture taken April 10, 2020. REUTERS/Thomas Peter

A barista puts money back in a box pulled by a rope as a transportation system after a cafe adopted a social distance policy for their customers amid fears of coronavirus outbreak in Bangkok, Thailand March 20, 2020. REUTERS/Chalinee Thirasupa

A barista serves beverages in single use cups inside a Starbucks in London, Britain, March 6, 2020. REUTERS/Henry Nicholls

A barista serves beverages in single use cups inside a Starbucks in London, Britain, March 6, 2020. REUTERS/Henry Nicholls

A barista stands beside an idle coffee machine as he waits for power to return during electrical load-shedding in Cape Town, South Africa, December 11, 2019. REUTERS/Mike Hutchings

A barista stands beside an idle coffee machine as he waits for power to return during electrical load-shedding in Cape Town, South Africa, December 11, 2019. REUTERS/Mike Hutchings

A barista prepares coffee at a store of Juan Valdez in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares coffee at a store of Juan Valdez in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares coffee at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares cappuccino at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares cappuccino at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares coffee at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

A barista prepares coffee at a Juan Valdez store in Bogota, Colombia June 5, 2019. Picture taken June 5, 2019. REUTERS/Luisa Gonzalez

Jenny Qian Zhiya CEO of Luckin Coffee, exchanges high-five with an barista Andrea Lattuada during the company's IPO at the Nasdaq Market site in New York, U.S., May 17, 2019. REUTERS/Brendan McDermid

A barista is pictured at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

A barista prepares a coffee for online sales at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

A barista packs a coffee for online sales at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

A barista delivers a coffee for a customer at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

Baristas work at a Luckin Coffee store in Beijing, China July 17, 2018. Picture taken July 17, 2018. REUTERS/Jason Lee

Baristas are seen at a new Starbucks Reserve flagship store in Beijing's Qianmen area, China June 30, 2018. REUTERS/Jason Lee

The signs of Starbucks Reserve are seen on the cups as a barista makes drip coffee at its new flagship store in Beijing's Qianmen area, China June 30, 2018. REUTERS/Jason Lee

A barista delivers a drip coffee to a woman at a new Starbucks Reserve flagship store in Beijing's Qianmen area, China June 30, 2018. REUTERS/Jason Lee

Barista Ola Helsingborg prepares a mojito cocktail made with a cold brew coffee during a visit at the Nestle Professional Beverage Center in Orbe, Switzerland May 31, 2018. Picture taken May 31, 2018. REUTERS/Denis Balibouse

Barista Ola Helsingborg prepares a mojito cocktail made with a cold brew coffee during a visit at the Nestle Professional Beverage Center in Orbe, Switzerland May 31, 2018. Picture taken May 31, 2018. REUTERS/Denis Balibouse

Patrick Stern, Head of Beverages of Nestle Professional, looks at Barista Ola Helsingborg preparing a coffee inspired cocktail during a visit at the Nestle Professional Beverage Center in Orbe, Switzerland May 31, 2018. Picture taken May 31, 2018. REUTERS/Denis Balibouse

A barista brews locally gown coffee at Jack Runner Roastery and cafe in Bandung, West Java, Indonesia, May 3, 2018. Picture taken May 3, 2018. REUTERS/Willy Kurniawan

A timer counts down on a stained apron of a Starbucks barista, before more than 8,000 branches nationwide will close this afternoon for anti-bias training, in Philadelphia, Pennsylvania U.S., May 29, 2018. REUTERS/Mark Makela

A Starbucks barista makes a hot beverage in a South Philadelphia store, before more than 8,000 branches nationwide will close this afternoon for anti-bias training, in Philadelphia, Pennsylvania U.S., May 29, 2018. REUTERS/Mark Makela

A Starbucks barista places a lid on a grande coffee ordered by Eam Chou, 62, in a South Philadelphia store, before more than 8,000 branches nationwide will close this afternoon for anti-bias training, in Philadelphia, Pennsylvania U.S., May 29, 2018. REUTERS/Mark Makela

A Starbucks barista locks up a South Philadelphia store, as more than 8,000 branches nationwide will close this afternoon for anti-bias training, in Philadelphia, Pennsylvania U.S., May 29, 2018. REUTERS/Mark Makela

A Starbucks barista makes a hot beverage in a South Philadelphia store, before more than 8,000 branches nationwide will close this afternoon for anti-bias training, in Philadelphia, Pennsylvania U.S., May 29, 2018. REUTERS/Mark Makela

A Starbucks barista fulfills an order in a South Philadelphia store, before more than 8,000 branches nationwide will close this afternoon for anti-bias training, in Philadelphia, Pennsylvania U.S., May 29, 2018. REUTERS/Mark Makela

A Starbucks barista fulfills an order in a South Philadelphia store, before more than 8,000 branches nationwide will close this afternoon for anti-bias training, in Philadelphia, Pennsylvania U.S., May 29, 2018. REUTERS/Mark Makela

A barista makes coffee for attendees at the Milken Institute's 21st Global Conference in Beverly Hills, California, U.S. April 30, 2018. REUTERS/Lucy Nicholson

Espresso coffee is brewed at a barista training center in Caracas, Venezuela April 3, 2018. Picture taken April 3, 2018. REUTERS/Marco Bello

Pietro Carbone speaks during a class at his barista training center in Caracas, Venezuela April 3, 2018. Picture taken April 3, 2018. REUTERS/Marco Bello

A woman takes an espresso coffee cup at a barista training center in Caracas, Venezuela April 3, 2018. Picture taken April 3, 2018. REUTERS/Marco Bello

Women taste coffee at a barista training center in Caracas, Venezuela April 3, 2018. Picture taken April 3, 2018. REUTERS/Marco Bello

People attend a class at a barista training center in Caracas, Venezuela April 3, 2018. Picture taken April 3, 2018. REUTERS/Marco Bello

A woman brews espresso coffee at a barista training center in Caracas, Venezuela April 3, 2018. Picture taken April 3, 2018. REUTERS/Marco Bello

A barista is seen behind a designed to get your order faster a new mobile order window being tested at a Starbucks coffee shop in downtown Los Angeles, California, U.S., March 15, 2018. Picture taken March 15, 2018. REUTERS/Mike Blake

A barista prepares coffee using a siphon brewing method as Starbucks Corp opens the first upscale Starbucks Reserve store at the Starbucks headquarters in Seattle, Washington, U.S., February 27, 2018. REUTERS/David Ryder

Baristas prepare drinks as Starbucks Corp opens the first upscale Starbucks Reserve store at the Starbucks headquarters in Seattle, Washington, U.S., February 27, 2018. REUTERS/David Ryder

A barista serves a customer as Starbucks Corp opens the first upscale Starbucks Reserve store at the Starbucks headquarters in Seattle, Washington, U.S., February 27, 2018. REUTERS/David Ryder

A man scans a QR code printed on a ticket used to order a coffee from the robot barista called "Sawyer" during its demonstration at "Henn-na Cafe," meaning "Strange Cafe" in Japanese, in Tokyo, Japan January 30, 2018. REUTERS/Kim Kyung-Hoon

The robot barista called "Sawyer" makes a coffee during its demonstration at "Henn-na Cafe," meaning "Strange Cafe" in Japanese, in Tokyo, Japan January 30, 2018. REUTERS/Kim Kyung-Hoon